Quote:
Originally Posted by MikeB
Well, "slightly" is a relative term. And it's very easy to know EXACTLY when the intake valve closes. Looking at CompCam's 268H, which has been very popular over the years, you will see the Intake Closing Angle at .006" tappet rise is 60 degrees ABDC (After Bottom Dead Center). I don't know about you, but I wouldn't call 60 degrees a "slight" part of 180 degrees. And this cam at 268/268, 218/218 has less duration than the one GM puts in the 290hp crate engine!
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I know what the compression is listed at and what its actually was measured at. This isnt my first time.
Your not going to find many shelf cams that are going to be able to build cylinder pressure in a lower static compression engine and still make more power. You can change the valve events to increase or decrease cylinder pressure but your still going to need the correct duration to make power.
Quote:
Originally Posted by 76stepside01
I just got this motor, and now I'm wondering if it be worth it to upgrade the cam?
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If your looking for a nice daily driver hot rod leave it alone. If your looking for serious power from it you should have started with a different engine. Its a fun engine for what it is, drop it in and enjoy it.